improvement: tab switch and overlay detection

Improved the detection so that when candiate is selection screen share
OS Native modal, or allowing permissions should not detect as a
Suspecious activity

resources/views/interview/candidate_room.blade.php

@@ -565,6 +565,24 @@ function submitSolution() {
 
         let isTabSwitchScreenshotEnabled = true;
         let lastTabSwitchTime = 0;
+        let pendingNativePrompts = 0;          // counter for native OS prompts
+        let suppressFocusViolationsUntil = 0;  // trailing buffer after prompt resolves
+
+        function beginNativePrompt() {
+            pendingNativePrompts++;
+        }
+
+        function endNativePrompt() {
+            pendingNativePrompts = Math.max(0, pendingNativePrompts - 1);
+        }
+
+        function armTrailingBuffer(ms) {
+            suppressFocusViolationsUntil = Math.max(suppressFocusViolationsUntil, Date.now() + ms);
+        }
+
+        function isFocusSuppressed() {
+            return pendingNativePrompts > 0 || Date.now() < suppressFocusViolationsUntil;
+        }
         let latestCallStatus = '{{ $interview->call_status ?? "idle" }}';
         let screenShareVideoElem = null;
 
@@ -728,6 +746,7 @@ function uploadTabScreenshotBlob(imageData, reason = 'tab_switch') {
 
         // 1. Tab Switch Detection (Captures Candidate's SYSTEM DESKTOP MONITOR screenshot)
         document.addEventListener('visibilitychange', function () {
+            if (isFocusSuppressed()) return;
             if (document.hidden) {
                 const now = Date.now();
                 if (now - lastTabSwitchTime > 1000) {
@@ -740,6 +759,7 @@ function uploadTabScreenshotBlob(imageData, reason = 'tab_switch') {
 
         // 2. Window Focus Loss / External AI Overlay Application Switch Detection
         window.addEventListener('blur', function () {
+            if (isFocusSuppressed()) return;
             const now = Date.now();
             if (now - lastTabSwitchTime > 1000) {
                 lastTabSwitchTime = now;
@@ -750,6 +770,7 @@ function uploadTabScreenshotBlob(imageData, reason = 'tab_switch') {
 
         // Mouse Viewport Departure (Candidate moving cursor outside window to interact with Parakeet AI or secondary app overlay)
         document.addEventListener('mouseleave', function () {
+            if (isFocusSuppressed()) return;
             const now = Date.now();
             if (now - lastTabSwitchTime > 2500) {
                 lastTabSwitchTime = now;
@@ -1550,6 +1571,8 @@ function startCandidateCameraStream() {
                 autoGainControl: true
             };
 
+            beginNativePrompt();
+
             return navigator.mediaDevices.getUserMedia({
                 video: {
                     width: { ideal: 1280 },
@@ -1563,6 +1586,7 @@ function startCandidateCameraStream() {
             .catch(() => navigator.mediaDevices.getUserMedia({ video: false, audio: true }))
             .catch(() => navigator.mediaDevices.getUserMedia({ video: true, audio: false }))
             .then(stream => {
+                endNativePrompt();
                 localMediaStream = stream;
                 const vid = document.getElementById('webcam');
                 if (vid) {
@@ -1589,6 +1613,7 @@ function startCandidateCameraStream() {
                 return stream;
             })
             .catch(err => {
+                endNativePrompt();
                 console.log('Candidate media access error:', err);
                 if (avatarPlaceholder) avatarPlaceholder.style.display = 'flex';
                 initCandidatePeer();
@@ -1729,6 +1754,17 @@ function toggleCam() {
             }
         }
 
+        function requestFullscreenAsPromise(elem) {
+            if (elem.requestFullscreen) {
+                return elem.requestFullscreen();
+            }
+            if (elem.webkitRequestFullscreen) {
+                elem.webkitRequestFullscreen();
+                return Promise.resolve();
+            }
+            return Promise.reject(new Error('Fullscreen not supported'));
+        }
+
         function requestProctoringFullscreen() {
             try {
                 const elem = document.documentElement;
@@ -1741,6 +1777,7 @@ function requestProctoringFullscreen() {
         }
 
         document.addEventListener('fullscreenchange', function() {
+            if (isFocusSuppressed()) return;
             if (!document.fullscreenElement) {
                 logViolation('tab_switch', 'Candidate exited full-screen proctoring mode (possible overlay AI window interaction)');
                 captureAndUploadTabScreenshot();
@@ -1826,6 +1863,8 @@ function startScreenShare() {
                 return;
             }
 
+            beginNativePrompt();
+
             navigator.mediaDevices.getDisplayMedia({
                 video: {
                     displaySurface: 'monitor'
@@ -1833,6 +1872,7 @@ function startScreenShare() {
                 audio: false
             })
             .then(stream => {
+                endNativePrompt();
                 const track = stream.getVideoTracks()[0];
                 const settings = track.getSettings ? track.getSettings() : {};
 
@@ -1870,7 +1910,13 @@ function startScreenShare() {
                     btn.style.background = '#10b981';
                 }
 
-                requestProctoringFullscreen();
+                beginNativePrompt();
+                requestFullscreenAsPromise(document.documentElement)
+                    .catch(() => {})
+                    .finally(() => {
+                        endNativePrompt();
+                        armTrailingBuffer(1000);
+                    });
 
                 // Connect screen stream to interviewer screen peer
                 const screenPeer = new Peer('cand_screen_' + interviewId + '_' + Date.now());
@@ -1891,6 +1937,7 @@ function startScreenShare() {
                 initLiveOverlayDetector();
             })
             .catch(err => {
+                endNativePrompt();
                 console.log('Screen sharing cancelled/denied:', err);
                 screenShareStream = null;
                 logViolation('tab_switch', 'Candidate denied or cancelled screen sharing permission prompt');